You should add a conditional check in your for loop that determines if the object you are getting from enumeration is in fact a CCLayer. Your crash log states that the anchorPoint setter was not available on some object, presumably on an object in your layers_ array since that is the code you have posted that deals with anchorPoints.

Enumeration is convenient, but you are casing all objects to CCLayer when it is possible that one of them is not. I don't know where you are adding objects to layers_ but is it possible you are adding an object that is not actually a CCLayer ?